CN111829366A - Heat Exchangers and Air Conditioning Units - Google Patents

Abstract

The invention relates to a heat exchanger and an air conditioning unit, wherein the heat exchanger comprises fins (10), and the fins (10) are provided with point-shaped first grooves (11) and communicate with the first grooves (11). There is a preset distance between two adjacent first grooves (11), and the length of the drainage groove (12) along the drainage direction is greater than the length of the first groove (11) along the drainage direction The length of the drain groove (12) is smaller than the depth of the first groove (11). The air conditioning unit includes a heat exchanger. The invention can increase the heat exchange area of the heat exchanger, thereby improving the heat exchange efficiency; it can also reduce the flow resistance and reduce the pressure loss, so as to further improve the heat exchange effect; and can also reduce the resistance to the fluid flowing through the surface of the fins .

Description

Heat Exchangers and Air Conditioning Units

technical field

The invention relates to the technical field of heat exchangers, in particular to a heat exchanger and an air conditioning unit.

Background technique

Tube-fin heat exchangers are widely used in air conditioners and HVAC equipment. Although this type of heat exchanger has a good heat exchange effect, it will form a large thermal resistance on the air side outside the tube, up to a total of It is about 80%-90% of the thermal resistance, which will increase the pressure loss of the fluid passing through its surface and greatly reduce the heat exchange efficiency of the heat exchanger. Therefore, it is necessary to optimize the structure of the fins.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a heat exchanger and an air conditioning unit, which can effectively improve the heat exchange efficiency and at the same time help to reduce the resistance of the fluid flowing through the surface thereof.

According to one aspect of the present invention, a heat exchanger is provided, which includes fins, and the fins are provided with point-shaped first grooves and a drainage groove communicating with the first grooves, and between two adjacent first grooves With a preset distance, the length of the drainage groove along the drainage direction is greater than the length of the first groove along the drainage direction, and the depth of the drainage groove is smaller than the depth of the first groove.

In some embodiments, the fin includes a first surface and a second surface opposite the first surface, and the first groove is provided on the first surface and/or the second surface.

In some embodiments, the fin includes a first surface and a second surface opposite the first surface, and the drain grooves are disposed on the first surface and/or the second surface.

In some embodiments, the interconnected first groove and the drain groove are provided on the same surface of the fin.

In some embodiments, the fin is provided with a plurality of first grooves and a plurality of liquid drainage grooves, and each liquid drainage groove communicates with at least two first grooves.

In some embodiments, the drainage grooves are arranged in a vertical direction.

In some embodiments, the drainage grooves extend from the top end of the fin to the bottom end of the fin.

In some embodiments, the shape of the cross-section of the drain includes a portion of a circle or a trapezoid.

In some embodiments, the fin includes a first region upstream and a second region downstream in the direction of fluid flow across the surface of the fin, and the volume of the first groove provided in the first region is greater than that provided in the first region. The volume of the first grooves in the two regions and/or the number of the first grooves provided in the first region is smaller than the number of the first grooves provided in the second region.

In some embodiments, the fin includes a first region upstream in the direction of fluid flow across the surface of the fin and a second region downstream, disposed between two adjacent first grooves in the first region The spacing is greater than the spacing between two adjacent first grooves disposed in the second region.

In some embodiments, the heat exchanger further includes a heat exchange tube in which a heat exchange medium circulates, the fins are provided with mounting holes for installing the heat exchange tubes, and a second recess is provided around the mounting holes and communicated with the drain groove. groove.

In some embodiments, the second groove is substantially flush with the bottom of the drainage groove.

According to another aspect of the present invention, an air conditioning unit is provided, comprising an evaporator and a condenser, the evaporator and/or the condenser comprising the above-mentioned heat exchanger.

Based on the above technical solutions, the fins of the embodiments of the present invention are provided with point-shaped first grooves, and there is a preset distance between two adjacent first grooves. The fins in this structural form can increase the size of the heat exchanger. In addition, it will not cause too much flow resistance to the fluid flowing through the surface of the fins, so it can also reduce the flow resistance, reduce the pressure loss, and further improve the heat exchange effect; in addition, The fins are also provided with a drainage groove that communicates with the first groove, through which the liquid accumulated on the leeward side of the first groove can be discharged in time to prevent the liquid accumulated on the leeward side from forming a liquid bridge and increasing wind resistance , reducing the efficiency of the heat exchanger; the depth of the drainage groove is less than the depth of the first groove, which can prevent the drainage groove with a longer length from forming too much wind resistance to the fluid flowing through the surface of the fin.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 is a schematic structural diagram of an embodiment of the heat exchanger of the present invention.

FIG. 2 is a top view of an embodiment of the heat exchanger of the present invention.

FIG. 3 is a cross-sectional view along the A-A section in the embodiment of FIG. 2 of the present invention.

FIG. 4 is a cross-sectional view of another embodiment of the present invention taken along the section A-A in FIG. 2 .

FIG. 5 is a cross-sectional view along the B-B section of the embodiment of FIG. 2 of the present invention.

FIG. 6 is a top view of an embodiment of the heat exchanger of the present invention.

FIG. 7 is a cross-sectional view along the C-C section in the embodiment of FIG. 6 of the present invention.

FIG. 8 is a partial structural schematic diagram of an embodiment of the heat exchanger of the present invention.

In the picture:

10, fins; 11, first groove; 12, drain groove; 13, second groove; 14, first surface; 15, second surface; 20, heat exchange tube.

Detailed ways

The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "horizontal", "portrait", "front", "rear", "left", "right", "top", "bottom", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present invention.

The inventor found through research that the overall surface of the fins in the related art is in the form of corrugations, that is, the length of the corrugations is long, and the corrugations are elongated. Although this structure can increase the heat exchange area of the fins, it also increases the heat transfer area. The airflow is disturbed on the surface of the fin, which greatly increases the flow resistance on the surface of the fin, so the pressure loss of the fluid passing through the surface is large.

As shown in FIG. 1 , in some embodiments of the heat exchanger provided by the present invention, the heat exchanger includes fins 10 , and the fins 10 are provided with point-shaped first grooves 11 and communicate with the first grooves 11 . There is a preset distance between the two adjacent first grooves 11, the length of the drainage groove 12 along the drainage direction is greater than the length of the first groove 11 along the drainage direction, the length of the drainage groove 12 The depth is smaller than that of the first groove 11 .

Wherein, "dot-shaped" means that the area occupied by a single first groove 11 on the fin 10 is very small relative to the entire surface of the fin 10 , which is different from the elongated groove.

In the above embodiment, the fins 10 are provided with point-shaped first grooves 11, and there is a preset distance between two adjacent first grooves 11. The fins 10 with this structure can increase heat exchange. In addition, it will not cause too much flow resistance to the fluid flowing through the surface of the fins 10, so it can also reduce the flow resistance, reduce the pressure loss, and further improve the heat exchange effect; In addition, the fins 10 are also provided with a drainage groove 12 that communicates with the first groove 11. Through the drainage groove 12, the liquid accumulated on the leeward side of the first groove 11 can be discharged in time to prevent the accumulation of liquid on the leeward side of the first groove 11. The liquid forms a liquid bridge to increase the wind resistance and reduce the efficiency of the heat exchanger; the depth of the drainage groove 12 is less than the depth of the first groove 11, which can prevent the longer length of the drainage groove 12 from forming too much of the fluid flowing through the surface of the fins wind resistance.

In some embodiments, the fins 10 are provided with a plurality of point-shaped first grooves 11 , and the plurality of first grooves 11 may be arranged in a row or scattered.

The distance between two adjacent first grooves 11 can be flexibly set according to actual needs. The distance between any two adjacent first grooves 11 may be equal or unequal.

As shown in FIGS. 2 , 3 and 4 , in some embodiments, the fin 10 includes a first surface 14 and a second surface 15 opposite to the first surface 14 , and the first groove 11 is provided on the first surface 14 and/or second surface 15 .

The first groove 11 provided on the first surface 14 protrudes from the first surface 14 to the direction close to the second surface 15 , and the first groove 11 provided on the second surface 15 is from the second surface 15 to the first surface. The direction of 14 is raised.

On the fin 10 , the first grooves 11 provided on the first surface 14 and the first grooves 11 provided on the second surface 15 can be arranged adjacently or at intervals, for example, two adjacent grooves 11 are arranged on the second surface 15 . There are two or more rows of first grooves 11 on the first surface 14 between the first grooves 11 on the surface 15 .

In some embodiments, the fin 10 includes a first surface 14 and a second surface 15 opposite the first surface 14, and the drain grooves 12 are disposed on the first surface 14 and/or the second surface 15.

On the fin 10 , the drainage grooves 12 provided on the first surface 14 and the drainage grooves 12 provided on the second surface 15 can be arranged adjacently or at intervals, for example, two adjacent ones are provided on the second surface 15 There are two or more rows of drainage grooves 12 disposed on the first surface 14 between the drainage grooves 12 .

In some embodiments, the mutually communicating first groove 11 and the drain groove 12 are provided on the same surface of the fin 10 . This arrangement facilitates the discharge of the liquid in the first groove 11 .

In some embodiments, the fins 10 are provided with a plurality of first grooves 11 and a plurality of liquid drainage grooves 12 , and each of the liquid drainage grooves 12 communicates with at least two first grooves 11 . This arrangement can reduce the number of the drainage grooves 12 and reduce the flow resistance of the drainage grooves 12 to the liquid flowing through the surface of the fins 10 as much as possible.

The size of the at least two first grooves 11 connected to each drain groove 12 may be the same or different.

In some embodiments, the plurality of drainage grooves 12 are arranged in parallel and uniformly, that is, the distance between two adjacent drainage grooves 12 is equal, so that the overall heat exchange effect of the fins 10 is relatively uniform.

In some embodiments, the drain grooves 12 are arranged in a vertical direction. In this way, the liquid can flow downward along the liquid drainage groove 12 under the action of its own weight, and no special liquid extraction device is required.

In some embodiments, the drain grooves 12 extend from the top ends of the fins 10 to the bottom ends of the fins 10 . In this way, each drainage groove 12 can be connected to more first grooves 11, the total number of drainage grooves 12 can be reduced, the area ratio of the drainage grooves 12 on the surface of the fins 10 can be reduced, and the obstruction to the flowing fluid can be reduced. .

In some embodiments, the shape of the cross-section of drain 12 includes a portion of a circle or a trapezoid. The cross section of the drain groove 12 is a cross section perpendicular to the drain direction. This cross-sectional shape facilitates receiving the fluid of the first groove 11 .

In some embodiments, the cross-sectional shape of the first groove 11 along a direction perpendicular to the drainage direction of the drainage groove 12 includes a part of a circle. This shape facilitates the accumulation of the liquid, makes the liquid flow to the drainage groove 12 as soon as possible and is discharged, and reduces the accumulation and retention of the liquid in the first groove 11 .

In some embodiments shown in FIGS. 2-5 , the cross-sectional shape of the first groove 11 includes a part of a circle, the cross-sectional shape of the drainage groove 12 includes a trapezoid, and the short side of the trapezoid is located in the drainage groove 12 the bottom of the tank, the long side of the trapezoid is located at the opening of the drainage tank 12.

In some embodiments shown in FIGS. 6-7 , the cross-sectional shape of the first groove 11 includes a part of a circle, and the cross-sectional shape of the drainage groove 12 includes a part of a circle.

In some embodiments, the fins 10 include a first upstream fin 10 in the direction of fluid flow across the surface of the fins 10 (indicated by the straight lines with arrows in FIGS. 1 , 2 and 6 , referred to as the incoming flow direction). A region and a second region located downstream, the volume of the first groove 11 provided in the first region is greater than the volume of the first groove 11 provided in the second region and/or the first groove provided in the first region The number of 11 is smaller than the number of first grooves 11 provided in the second region.

In some embodiments, the fin 10 includes a first region upstream and a second region downstream in the direction of fluid flow across the surface of the fin 10, two adjacent first grooves disposed in the first region The distance between the two adjacent first grooves 11 is greater than the distance between the two adjacent first grooves 11 in the second region.

This arrangement can make the first grooves 11 in the second region larger in size, larger in number or smaller in spacing, thereby increasing the heat exchange efficiency of the second region, reducing the heat exchange difference between the upstream and downstream regions, and making the The overall heat exchange effect of the heat exchanger remains uniform.

The first area is located on the windward side of the fin 10 , and the second area is located on the leeward side of the fin 10 . The first area may be an area close to the incoming flow bounded by the midline of the fin 10 perpendicular to the incoming flow direction, and the second area may be an area away from the incoming flow bounded by the midline of the fin 10 perpendicular to the incoming flow direction. flow area.

In the first area, the fin 10 includes multiple rows of first grooves 11 , the volume and number of the multiple rows of first grooves 11 and the difference between two adjacent first grooves 11 in each row of the first grooves 11 The spacing can be equal or unequal.

In the second area, the fin 10 includes multiple rows of first grooves 11 , the volume and number of the multiple rows of first grooves 11 and the difference between two adjacent first grooves 11 in each row of the first grooves 11 The spacing can be equal or unequal.

In some embodiments, the fins 10 are provided with multiple rows of first grooves 11 arranged in a direction perpendicular to the incoming flow direction. The number of the first grooves 11 gradually increases, and the spacing between two adjacent first grooves 11 in each row of the first grooves 11 gradually decreases.

In some embodiments, the heat exchanger further includes a heat exchange tube 20 with a heat exchange medium circulating therein, the fins 10 are provided with mounting holes for installing the heat exchange tubes 20 , and around the mounting holes are provided with a communication with the drain groove 12 the second groove 13.

By setting the second groove 13, it is convenient to collect the condensed water on the surface of the heat exchange tube 20, so that this part of the condensed water can be discharged through the drain groove 12 in time, so as to avoid the condensed water from accumulating and affecting the heat exchange effect.

As shown in FIG. 5 , in some embodiments, the second groove 13 is substantially flush with the bottom of the drainage groove 12 . In this way, the second groove 13 can be communicated with the drain groove 12 to avoid liquid accumulation due to a step change between the depths of the two, so that the accumulated liquid in the second groove 13 can enter the drain groove 12 and be discharged in time.

As shown in FIG. 8 , the diameters R ₁ and R ₂ of the two first grooves 11 are different in size, and R ₁ >R ₂ . The line connecting the centers of the circles where the two first grooves 11 are located may be parallel to the surface of the fin 10 . In other embodiments, in order to realize that the sizes of the two first grooves 11 are different, the diameters of the circles where the two first grooves 11 are located can also be equal in size, but the line connecting the centers of the circles is not parallel to the surface of the fin 10. In this way, the sizes of the grooves provided on the surfaces of the fins 10 can also be different.

As shown in FIG. 8 , the cross-sectional shapes of the two drainage grooves 12 are both isosceles trapezoids, but the dimensions of the two drainage grooves 12 are different, 0<L ₁ <R ₂ <R ₁ , L ₂ <R ₁ /2, L ₃ ≤R ₁ , L ₅ <R ₂ /2, L ₆ ≤R ₂ , L ₁ ≤L ₄ ≤R ₁ , L ₁ ≤L ₇ ≤R ₂ . These size ranges can make the depth of the drainage groove 12 smaller than the depth of the first groove 11, and at the same time, the liquid in the first groove 11 can flow into the drainage groove 12 as much as possible, so that the liquid can be discharged as soon as possible and reduce the amount of liquid The accumulation of fins does not cause too much resistance to the fluid flowing through the surface of the fins 10 .

Based on the heat exchangers in the above-mentioned embodiments, the present invention further provides an air-conditioning unit, the air-conditioning unit includes an evaporator and a condenser, and the evaporator and/or the condenser includes the above-mentioned heat exchanger.

The positive technical effects of the heat exchangers in the above-mentioned embodiments are also applicable to the air-conditioning units, which will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: without departing from the Under the premise of the principle of the present invention, it is still possible to modify the specific embodiments of the present invention or perform equivalent replacements to some technical features, and these modifications and equivalent replacements should be included in the scope of the technical solutions claimed in the present invention.

Claims (13)

1. The heat exchanger is characterized by comprising fins (10), wherein the fins (10) are provided with point-like first grooves (11) and liquid discharge grooves (12) communicated with the first grooves (11), a preset distance is reserved between every two adjacent first grooves (11), the length of the liquid discharge grooves (12) along the liquid discharge direction is larger than that of the first grooves (11) along the liquid discharge direction, and the depth of the liquid discharge grooves (12) is smaller than that of the first grooves (11).

2. The heat exchanger according to claim 1, characterized in that the fin (10) comprises a first surface (14) and a second surface (15) opposite to the first surface (14), the first groove (11) being provided at the first surface (14) and/or the second surface (15).

3. Heat exchanger according to claim 1, wherein the fin (10) comprises a first surface (14) and a second surface (15) opposite to the first surface (14), the drainage grooves (12) being provided at the first surface (14) and/or the second surface (15).

4. The heat exchanger according to claim 1, characterized in that the first groove (11) and the drainage groove (12) communicating with each other are provided on the same surface of the fin (10).

5. Heat exchanger according to claim 1, characterized in that said fin (10) is provided with a plurality of said first grooves (11) and a plurality of said drainage grooves (12), each of said drainage grooves (12) communicating at least two of said first grooves (11).

6. Heat exchanger according to claim 1, wherein the drainage grooves (12) are arranged in a vertical direction.

7. The heat exchanger according to claim 1, characterized in that the drainage grooves (12) extend from the top end of the fin (10) to the bottom end of the fin (10).

8. Heat exchanger according to claim 1, wherein the cross-sectional shape of the drain tank (12) comprises a portion of a circle or a trapezoid.

9. The heat exchanger according to claim 1, characterized in that the fin (10) comprises a first zone upstream and a second zone downstream in the direction of fluid flow over the surface of the fin (10), the first grooves (11) provided in the first zone having a larger volume than the first grooves (11) provided in the second zone and/or the number of first grooves (11) provided in the first zone being smaller than the number of first grooves (11) provided in the second zone.

10. The heat exchanger according to claim 1, characterized in that the fin (10) comprises a first region upstream and a second region downstream in the direction of flow of the fluid over the surface of the fin (10), the spacing between two adjacent first grooves (11) provided in the first region being greater than the spacing between two adjacent first grooves (11) provided in the second region.

11. The heat exchanger according to claim 1, further comprising a heat exchange tube (20) through which a heat exchange medium flows, wherein the fin (10) is provided with a mounting hole for mounting the heat exchange tube (20), and a second groove (13) communicated with the liquid discharge groove (12) is formed around the mounting hole.

12. The heat exchanger according to claim 11, characterized in that the second groove (13) is substantially flush with the bottom of the drain tank (12).

13. An air conditioning assembly comprising an evaporator and a condenser, the evaporator and/or the condenser comprising a heat exchanger according to any one of claims 1 to 12.

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